12521121 has 8 divisors (see below), whose sum is σ = 16720704. Its totient is φ = 8334480.

The previous prime is 12521107. The next prime is 12521137. The reversal of 12521121 is 12112521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12521121 - 2¹⁹ = 11996833 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12521121.

It is not an unprimeable number, because it can be changed into a prime (12521101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 690 + ... + 5051.

It is an arithmetic number, because the mean of its divisors is an integer number (2090088).

Almost surely, 2^12521121 is an apocalyptic number.

It is an amenable number.

12521121 is a deficient number, since it is larger than the sum of its proper divisors (4199583).

12521121 is an equidigital number, since it uses as much as digits as its factorization.

12521121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6471.

The product of its digits is 40, while the sum is 15.

The square root of 12521121 is about 3538.5196057108. The cubic root of 12521121 is about 232.2100814588.

Adding to 12521121 its reverse (12112521), we get a palindrome (24633642).

The spelling of 12521121 in words is "twelve million, five hundred twenty-one thousand, one hundred twenty-one".